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Chemical & atomic studies of the heaviest elements with JAEA-ISOL; Measurements of the first ionization potentials and study of thermochemical properties

JAEA-ISOLを用いた重元素の原子科学および化学研究; 第一イオン化エネルギー測定と熱化学的性質の研究

佐藤 哲也   

Sato, Tetsuya

オンライン同位体分離器JAEA-ISOLを使用して、強い相対論的効果の影響を受ける原子番号Z$$>$$100の重い元素の化学的性質および原子の性質を調べた。表面電離イオン化法によりフェルミウム(Fm, Z=100)からローレンシウム(Lr, Z=103)までの重アクチニド元素の第一イオン化エネルギー(IP$$_1$$)を決定した。さらに真空クロマトグラフ法とISOL表面電離イオン源による表面イオン化を組み合わせた新しい手法により、Lrの吸着挙動を調べた。

The chemical and atomic properties of the heavy elements with atomic numbers Z $$>$$ 100, affected by strong relativistic effects, are studied at an-atom-at-a-time scale using the JAEA-ISOL. We successfully determined the first ionization potential (IP$$_1$$) values of heavy actinide elements from fermium (Fm, Z = 100) to lawrencium (Lr, Z = 103) by using a surface ion-source installed in the Isotope Separator On-Line (ISOL) at the JAEA tandem accelerator facility. The adsorption behavior of Lr is being studied by a newly developed method combining vacuum chromatography with surface ionization in a metallic column/ionizer of the ISOL as well.

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